From b4978e949104844224ecf786170c9263efa601f3 Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Fri, 23 Jan 2009 18:23:03 +0200 Subject: UBIFS: always clean up GC LEB space When we mount UBIFS, GC LEB may contain out-of-date information, and UBIFS should update lprops and set free space for thei LEB. Currently UBIFS does this only if mounted R/W. But for R/O mount we have to do the same, because otherwise we will have incorrect FS free space reported to user-space. Signed-off-by: Artem Bityutskiy --- fs/ubifs/super.c | 47 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 33 insertions(+), 14 deletions(-) (limited to 'fs/ubifs') diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 5c814a71f33..336073e4c39 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -397,6 +397,7 @@ static int ubifs_statfs(struct dentry *dentry, struct kstatfs *buf) buf->f_namelen = UBIFS_MAX_NLEN; buf->f_fsid.val[0] = le32_to_cpu(uuid[0]) ^ le32_to_cpu(uuid[2]); buf->f_fsid.val[1] = le32_to_cpu(uuid[1]) ^ le32_to_cpu(uuid[3]); + ubifs_assert(buf->f_bfree <= c->block_cnt); return 0; } @@ -735,12 +736,12 @@ static void init_constants_master(struct ubifs_info *c) * take_gc_lnum - reserve GC LEB. * @c: UBIFS file-system description object * - * This function ensures that the LEB reserved for garbage collection is - * unmapped and is marked as "taken" in lprops. We also have to set free space - * to LEB size and dirty space to zero, because lprops may contain out-of-date - * information if the file-system was un-mounted before it has been committed. - * This function returns zero in case of success and a negative error code in - * case of failure. + * This function ensures that the LEB reserved for garbage collection is marked + * as "taken" in lprops. We also have to set free space to LEB size and dirty + * space to zero, because lprops may contain out-of-date information if the + * file-system was un-mounted before it has been committed. This function + * returns zero in case of success and a negative error code in case of + * failure. */ static int take_gc_lnum(struct ubifs_info *c) { @@ -751,10 +752,6 @@ static int take_gc_lnum(struct ubifs_info *c) return -EINVAL; } - err = ubifs_leb_unmap(c, c->gc_lnum); - if (err) - return err; - /* And we have to tell lprops that this LEB is taken */ err = ubifs_change_one_lp(c, c->gc_lnum, c->leb_size, 0, LPROPS_TAKEN, 0, 0); @@ -1280,10 +1277,19 @@ static int mount_ubifs(struct ubifs_info *c) if (err) goto out_orphans; err = ubifs_rcvry_gc_commit(c); - } else + } else { err = take_gc_lnum(c); - if (err) - goto out_orphans; + if (err) + goto out_orphans; + + /* + * GC LEB may contain garbage if there was an unclean + * reboot, and it should be un-mapped. + */ + err = ubifs_leb_unmap(c, c->gc_lnum); + if (err) + return err; + } err = dbg_check_lprops(c); if (err) @@ -1292,6 +1298,16 @@ static int mount_ubifs(struct ubifs_info *c) err = ubifs_recover_size(c); if (err) goto out_orphans; + } else { + /* + * Even if we mount read-only, we have to set space in GC LEB + * to proper value because this affects UBIFS free space + * reporting. We do not want to have a situation when + * re-mounting from R/O to R/W changes amount of free space. + */ + err = take_gc_lnum(c); + if (err) + goto out_orphans; } spin_lock(&ubifs_infos_lock); @@ -1316,6 +1332,8 @@ static int mount_ubifs(struct ubifs_info *c) goto out_infos; c->always_chk_crc = 0; + /* GC LEB has to be empty and taken at this point */ + ubifs_assert(c->lst.taken_empty_lebs == 1); ubifs_msg("mounted UBI device %d, volume %d, name \"%s\"", c->vi.ubi_num, c->vi.vol_id, c->vi.name); @@ -1561,7 +1579,7 @@ static int ubifs_remount_rw(struct ubifs_info *c) if (c->need_recovery) err = ubifs_rcvry_gc_commit(c); else - err = take_gc_lnum(c); + err = ubifs_leb_unmap(c, c->gc_lnum); if (err) goto out; @@ -1786,6 +1804,7 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) c->bu.buf = NULL; } + ubifs_assert(c->lst.taken_empty_lebs == 1); return 0; } -- cgit v1.2.3